25acaa5878
Only tested with basic tx blocking, ie, the same example code as on F2/F4, but the description of the block is almost identical.
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/l1/rcc.h>
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#include <libopencm3/stm32/l1/gpio.h>
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#include <libopencm3/stm32/usart.h>
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void clock_setup(void) {
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/* We are running on MSI after boot. */
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/* Enable GPIOD clock for LED & USARTs. */
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rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_GPIOAEN);
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rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_GPIOBEN);
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/* Enable clocks for USART2. */
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
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}
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void usart_setup(void) {
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/* Setup USART2 parameters. */
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usart_set_baudrate(USART2, 38400);
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usart_set_databits(USART2, 8);
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usart_set_stopbits(USART2, USART_STOPBITS_1);
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usart_set_mode(USART2, USART_MODE_TX);
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usart_set_parity(USART2, USART_PARITY_NONE);
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usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART2);
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}
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void gpio_setup(void) {
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/* Setup GPIO pin GPIO7 on GPIO port B for Green LED. */
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gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO7);
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/* Setup GPIO pins for USART2 transmit. */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
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/* Setup USART2 TX pin as alternate function. */
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gpio_set_af(GPIOA, GPIO_AF7, GPIO2);
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}
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int main(void) {
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int i, j = 0, c = 0;
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clock_setup();
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gpio_setup();
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usart_setup();
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/* Blink the LED (PD12) on the board with every transmitted byte. */
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while (1) {
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gpio_toggle(GPIOB, GPIO7); /* LED on/off */
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usart_send_blocking(USART2, c + '0'); /* USART2: Send byte. */
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c = (c == 9) ? 0 : c + 1; /* Increment c. */
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if ((j++ % 80) == 0) { /* Newline after line full. */
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usart_send_blocking(USART2, '\r');
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usart_send_blocking(USART2, '\n');
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}
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for (i = 0; i < 100000; i++) /* Wait a bit. */
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__asm__("NOP");
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}
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return 0;
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}
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